It's silly to see the law chewing up so much time and talent for a prosecution so at odds with the public interest.
If I were a WY legislator, I'd propose an implied 5ft public access easement on all such crossings.
"The de minimis rule is seldom relevant in criminal law (so, for, example, the offence of theft is made out whether the property taken is worth one penny or £1 million) but it is not wholly irrelevant. For example, a shopkeeper who hangs a rack of newspapers on the outer wall of his shop abutting the highway may be acquitted of obstruction of the highway on the basis of de minimis non curat lex."
Judge fined him 10 cents.